Light Control with Liquid Crystalline Elastomers
Light Control with Liquid Crystalline Elastomers
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DOI：
10.1002/adom.201801683
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发表时间：
2019-03-19
影响因子：
9
通讯作者：
White, Timothy J.
中科院分区：
文献类型：
--
作者：
Brannum, Michelle T.;Steele, Aubrey M.;White, Timothy J.
报道了一种简单易行的保持液晶相的主链液晶弹性体的合成方法。在这些固体膜中，在整个可见光谱中，该相固有的选择性反射被热调谐超过200 nm。的光学响应是直接相关的热机械膨胀的CLCE膜厚度。的CLCEs的选择性反射的带宽增加到200 nm以上，通过掺入光敏手性掺杂剂，引入异质性的间距分布。这种CLCE薄膜的镜面反射也是热致变色的，从可见光转变为红外线。联想到头足类动物，当与体素化的液晶弹性体的机械变形相结合时，CLCE的热致变色响应产生具有镜面反射和漫反射的并发变化的固态元素。这些结果表明，液晶弹性体控制光的独特的潜在机会，使新的应用在纺织品，光学和建筑。
The facile synthesis of well-aligned, main-chain liquid crystalline elastomers that retain the cholesteric phase (CLCEs) is reported. The selective reflection inherent to this phase is thermally tuned more than 200 nm in these solid films, across the visible spectrum. The optical response is directly correlated to thermomechanical expansion of the CLCE film thickness. The bandwidth of the selective reflection of the CLCEs is increased to more than 200 nm by the incorporation of photosensitive chiral dopants that introduce heterogeneity in the pitch distribution. The mirror-like reflection of this CLCE film is also thermochromic, shifting from the visible to infrared. Reminiscent of cephalopods, when combined with the mechanical deformation of voxelated nematic liquid crystal elastomer, the thermochromic response of the CLCE produces solid-state elements with concurrent variation of specular and diffuse reflectance. These results demonstrate distinctive potential opportunities for liquid crystal elastomers to control light enabling new application in textiles, optics, and architecture.